MX2009006022A

MX2009006022A - Light fitting for the exterior environment and public highways with leds as lighting element.

Info

Publication number: MX2009006022A
Application number: MX2009006022A
Authority: MX
Inventors: Alfredo Villafranca Quinto
Original assignee: Alfredo Villafranca Quinto
Priority date: 2009-06-05
Filing date: 2009-06-05
Publication date: 2010-12-13
Also published as: EP2442011A1; EP2442011A4; US8434895B2; US20110176300A1; WO2010140875A1

Abstract

The present invention relates to the industry of light-fitting production and, more specifically, to the manufacture of light fittings with the capacity to illuminate public highways by means of sets of LEDs as lighting elements. The advantage of the present invention as compared with those of the prior art lies in that the lamp that is the subject of the present invention is small and light in weight, allows an energy-consumption saving, with suitable dissipation of the heat produced by the LEDs using only the aluminium plate, which does not pick up spurious signals or radiate any signal and has a power factor as close as possible to one. Structurally, the invention is characterized in that it comprises a composite plate on which the LEDs are secured, said composite plate comprising, in the upper part, a sheet of aluminium that, on the lower face thereof, has a dielectric film adhered to it that electrically insulates said plate from the next layer that comprises the copper strips us ed to electrically connect the LEDs in series to the power source, and underneath the layer formed by the strips is a further dielectric film.

Description

LUMINAIRES FOR EXTERIORS AND PUBLIC ROADS WITH LED'S AS ELEMENTS OF LIGHTING FIELD OF THE INVENTION The present invention is related to the industry of the production of outdoor luminaires with the lighting capabilities of public road luminaires and more specifically with the manufacture of luminaires with the ability to illuminate public roads by means of sets of LEDs.

BACKGROUND OF THE INVENTION In the state of the art there are luminaires that light streets, buildings, warehouses, warehouses, parking lots, pedestrian bridges, parks, but use incandescent lamps, steam lights.

There are even LEDS luminaires but they are very heavy and to avoid heating the luminaire and to achieve the proper light intensity, they increase their dimensions considerably to give sufficient space between each LED.

Precisely to achieve heat dissipation, some luminaires rias have the so-called "heat sink" but this makes them very heavy.

Then, a light and small luminaire would have a competitive advantage with respect to the luminaires of the state of the art, also seeking to have a competitive lighting capacity.

The luminaire can save energy consumption but give the same light intensity as other luminaires. That lowers fossil energy consumption and saves money for the user in the long term. The LEDs also have a lifespan between 10 and 15 years depending on the number of hours used. The source can fail after 5 years but with simple maintenance the luminaire still works as before. The LEDs are very robust.

Returning, to the thermal aspect of the luminaires of the state of the art, it is known that each LED has to dissipate the heat that it produces and if these are very close then they can be affected in their operation. It is recommended to use one square inch of plate per LED.

We can therefore say that many of the luminaires of the state of the art with equivalent power or equivalent light output have an excessive weight of up to more than three times.

The use of LEDs makes luminaires with longer life and with a much lower power consumption and with a lower heat production.

OBJECTIVES OF THE INVENTION One of the objects of the present invention is to achieve a small and light luminaire.

Another objective of the invention is to achieve a lamp that allows a saving in energy consumption compared to other lamps of equal power or equal production of light.

Still another objective is to achieve the adequate dissipation of the heat produced by the LEDs with only the aluminum plate.

Another objective is to have a luminaire that does not pick up parasitic signals or radiate any signal and that has a power factor as close as possible to 1.

And other objectives that will become apparent with the detailed description accompanied by the drawings, which for illustrative but not limitative purposes, were included in the present.

BRIEF DESCRIPTION OF THE INVENTION In short, the present invention is based on an organization structure of LEDs that make the luminaires reproducing said structure and organization lighter and smaller than those of the state of the art and with competitive lighting.

To achieve these characteristics of the luminaries, they had to face above all with problems of heat management generated by the LEDs and harmonic problems, both those generated and those that could be captured by the formation of an antenna by the tracks of the led's, otherwise this aspect of the design would have been taken care of.

For this, the luminaire object of the present description uses a multilayer plate. The upper layer is an aluminum plate. Below this is a layer of dielectric to electrically insulate this aluminum plate on its underside. Although this dielectric is an insulator of electricity, heat transmits it quite a lot.

Above the upper dielectric, there are the electricity supply tracks of the led's, which are copper tracks with a lay out of the connections that prevent the said They are transformed into an antenna, thus avoiding that it does not radiate and also preventing it from capturing other radiations.

Above the tracks, another layer of dielectric is located in all those areas where the terminals of the LEDs are not connected to the tracks and where the pad located between the electrical terminals of the LEDs will dissipate the heat generated by these.

On the other hand, the distribution of the tracks to connect the LEDs in a precise order and without the need for crossings is also the object of the present invention and is what allows to comply with the neutralization of the antenna effect in the copper tracks.

Making a numbering of the led's on the plate starting with the upper row from left to right and continuing with the row immediately below until finishing with all the rows.

This distribution was the result of multiple experiences since there is no rule that tells us how to neutralize the antenna effect with the distribution of the LEDs.

In the case of the present invention, in the modality in which 36 led's are used, these are distributed forming three upper rows of 6 led's each. Then you have a lower row of 5 led's, then, down, two rows of 4 led's are formed each, to finish with two more rows, one of 3 and the lower one of 2 led's.

The order of connection is DS9, DS20, DS21, DS22, DS23, DS24, DS25, DS36, DS35, DS34, DS33, DS32, DS31, DS25, DS26, DS27, DS28, DS29, DS30, DS13, DS14, DS15, DS9 , DS8, DS7, DS1, DS2, DS3, DS4, DS5, DS6, DS12, DS11, DS10, DS16, DS17, DS18.

All this without crossings of tracks, all the LEDs in series and the track that leaves from the connector to connect to led 9, runs downwards, until reaching below the last row of LEDs, then to the left until exceeding the left end of the last row and continue parallel to the edges of the led's on the left side until you reach led 9.

Although this may not be necessary, the led's in each row are equidistant and the rows are also equidistant In the luminaire mode of 18 led's, the same number of rows are formed, but the upper one is only formed by 2 rows, the one that follows it downwards by four and to make the position of each led more precise, we show below its coordinates in table 1. On the left side of the number of the led is the number of LEDs that in the previous mode occupied this position. tion.

TABLE 1 Coordinates of the led's on the board The order of connection in this mode is the following: DS13, DS14, DS15, DS9, DS8, DS7, DS1, DS2, DS3, DS4, DS5, DS6, DS12, DS11, DS10, DS16, DS17, DS18.

In order to better understand the characteristics of the invention, the present description, as an integral part thereof, is accompanied by the drawings, which are illustrative but not limitative, which are described below.

BRIEF DESCRIPTION OF THE FIGURES Figure 1 schematizes a cross section of the plate where the LEDs are connected, showing their layers.

Figure 2 schematizes the way in which the LED's are connected electrically in the copper tracks and how the heat is diffused towards the aluminum plate.

Figure 3 illustrates connections and location of the led's on the board in the 36 LED's mode.

Figure 4 illustrates connections and location of the led's on the board in the 18-LED mode.

For a better understanding of the invention, a detailed description will be made of some of the modalities thereof, shown in the drawings that are attached to the present description for non-limiting illustrative purposes.

DETAILED DESCRIPTION OF THE INVENTION In order to achieve the objectives set for the present invention, it was fundamentally required to use a structure that would allow the heat generated by the led's to be diffused into the environment and a distribution and connection of said led's that would avoid the antenna effect of the copper tracks for the connection of the led's in series.

In addition to the antenna effect that was solved with the distribution and the connection shape of the LEDs, the metal plate of the luminaire was also landed with a wire-braid cable and a power cable with noise protection was used. A ferrite was also needed in the power cord.

In order to manufacture the luminaire, it became necessary to use an O-Ring that was used to sit around the housing. When the luminaire is closed it acts as a package. The MCPCB is sealed with a special glue that places the aluminum with the polycarbonate permanently applying a silicone cord in case there is a possibility of leakage.

The luminaire has transparent polycarbonate to let the light out. It has a loss of 12 percent but, it is light, flexible, does not break easily and can survive strong impacts.

The LED's are placed close enough to let the light that comes out 80 degrees above the vertical, collide with the car-house and be reflected.

Each LED carries a protection, if an LED fails, a component in parallel makes a "bypass". This prevents a catastrophic failure, so that the luminaire does not turn off immediately.

The elimination of heat is achieved in the present invention by means of the "Metal Core Printed Circuit Board" (MCPCB) This plate is made for different LEDs. The LEDs are the Charge of the source. Many carry the same electrical characteristics. If the design voltage is around 3.2V (Vf) and 350mA consumption, we can use it.

In addition we have to see the optical characteristics as the angle of light output so that it has the best amount of light coming out of the luminaire. That is the characteristic of the luminaire, that allows the client to have the quantity, color, Angle required for their application.

To achieve heat dissipation, a plate design is used in the luminaire, to which the LED's will be electrically and mechanically linked.

This plate is called "Metal Core Printed Circuit Board" (MCPCB).

Figure 1 schematizes a cross section of the plate where the they connect the led's, showing their layers. The number 1 indicates the aluminum plate where the other layers are fixed. The number 2 indicates the dielectric layer which, although electrically isolated, allows the passage of heat to reach the aluminum plate very well.

Below this layer of dielectric copper tracks 3 are located for the electrical connection of the led's. Another layer of white dielectric is placed on top of the copper tracks 4.

Figure 2 schematizes the way in which the LED's are connected electrically in the copper tracks and how the heat is diffused towards the aluminum plate. In this figure, in addition to the elements already mentioned in the description of figure 1, the led 5 and the schematic flow of heat 6 can be seen.

Figure 3 illustrates connections and location of LEDs 5 on the CPCB 7 board in the 36 LED's mode. The connections are made through the copper tracks 3.

Figure 4 illustrates the connections and location of the LED's on the MCPCB board in the 18-LED mode. The same elements shown in figure 3 are shown here.

Due to the characteristics of the MCPCB board, it is possible to connect rivers types of LEDs, but keeping the same organization in the connections. The modalities illustrated in figures 3 and 4 are made for the CREE ™ LEDs. It is also feasible to use the same OSRAM ™ led plates. However for the latter the organization would occupy less surface.

The invention has been sufficiently described so that a person with average skill in the art can reproduce and obtain the results that we mentioned in the present invention. Nevertheless, any person skilled in the art who is competent in the present invention may be able to make modifications not described in the present application, however, if for the application of these modifications in a certain structure or in the manufacturing process thereof , it is required of the matter claimed in the following claims, said structures should be included within the scope of the invention.

Claims

R E I V I N D I C A C I O N S Having described the invention, it is considered as a novelty and therefore the content of the following claims is claimed as property.

1. Luminaires for exteriors and public roads with LEDs, as lighting elements, characterized by comprising a composite plate on which the LEDs are fixed; said composite plate comprises, in the upper part, an aluminum foil, which has a dielectric film adhered to its lower face, which electrically insulates said plate from the next layer consisting of the copper tracks used to electrically connect the LEDs in series to the source of power; below the layer formed by the tracks there is another dielectric film.

2. Luminaires for exteriors and public roads with LED's as lighting elements, as claimed in the previous claim, also characterized in that the composite plate forms part of the housing, leaving the upper face of the aluminum sheet exposed to the weather, form the upper part of said casing.

3. Luminaires for exteriors and public roads with LEDs, as lighting elements, as claimed in the claim 1 or 2, also characterized in that in parallel to each LED, an electrical circuit is included that shortens the LED when it stops working.

4. Luminaires for exteriors and public roads with LEDs, as lighting elements, as claimed in any of the rei indications 1 to 3, also characterized because the luminaire comprises 18 LEDs the LEDs are connected in series in the following order: DS13, DS14, DS15, DS9, DS8, DS7, DS1, DS2, DS3, DS4, DS5, DS6, DS12, DS11, DS 10, DS16, DS17, DS18, with the LEDs numbered from left to right and from top to bottom, and no crossings in the connection tracks.

5. Luminaires for exteriors and public roads with LEDs, as lighting elements, as claimed in any of claims 1 to 3, also characterized because the luminaire comprises 36 LED's the LEDs are connected in series in the following order: DS9 , DS20, DS21, DS22, DS23, DS24, DS25, DS36, DS35, DS34, DS33, DS32, DS31, DS25, DS26, DS27, DS28, DS29, DS30, DS13, DS14, DS15, DS9, DS8, DS7, DS 1, DS2, DS3, DS4, DS5, DS6, DS12, DS11, DS10, DS16, DS17, DS18, with IOS led's numbered from left to right and from top to bottom, and without junctions in the connection tracks. SUMMARY The present invention is related to the industry of the production of outdoor luminaires and more specifically to the manufacture of luminaires with the lighting capacity of public roads by means of sets of LEDs as lighting elements. The advantage of the present invention with respect to those of the state of the art is that the lamp object of the present invention is small and light; that allows an o-rro in the consumption of energy, with an adequate dissipation of the heat produced by the LEDs with only the aluminum plate, which does not pick up parasitic signals or radiate any signal and that has a power factor as close as possible a 1. Structurally it is characterized because it includes a composite plate on which the LEDs are fixed; said composite plate comprises, in the upper part, an aluminum foil, which has a dielectric film adhered to its lower face, which electrically insulates said plate from the next layer consisting of the copper tracks used to electrically connect the LEDs in series to the source of power; below the layer formed by the tracks there is another dielectric film.